I’m no expert but how could he say it was dormant with nothing to compare it to. Also if you are feeling symptoms it is hardly dormant. I got diagnosed recently after going to the doctors a few years back with a painless limp. I didn’t think I had other symptoms but the more I read about this I am convinced I’ve had this for quite a few more years than I than I realised. In the letter from the neurologist diagnosing it he says the likely onset was 2016 – I now think I had symptoms as far back as 2007. Only little things which I largely ignored or thought “that was weird” and carried on.